CVE-2017-1000209: Nv-Websocket-Client Project Nv-Websocket-Client

Medium severity, CVSS 5.9. EPSS: 0.7% chance of exploitation in the next 30 days.

The Java WebSocket client nv-websocket-client does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate, which allows man-in-the-middle attackers to spoof SSL/TLS servers via an arbitrary valid certificate.

Affected products

• Nv-Websocket-Client Project Nv-Websocket-Client: up to and including 2.2

Published 2017-11-17. Last modified 2026-06-17.